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Taiwan Semiconductor Corporation SMAJ16
- Part No.:
- SMAJ16
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ16.pdf
- Description:
- 400W, 19.8V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,166
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Product details
Overview
SMAJ16 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping ESD and surge transients in DC power lines. It features a 16 V working stand-off voltage (VWM), 17.8–21.8 V breakdown voltage (VBR), 28.8 V maximum clamping voltage (VC) at 13.9 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - ideal for protecting 15 V rail inputs in industrial DC/DC converters.
For engineers reviewing the SMAJ16 datasheet, SMAJ16 pinout, SMAJ16 application, or SMAJ16 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on 1.6 mm thick PCBs using standard reflow profiles.
Technical Context
The SMAJ16 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (17.8–21.8 V @ 1 mA test current). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA @ 16 V), while fast response time (<1.0 ps) enables effective suppression of nanosecond-scale transients.
Thermal design relies on its 150°C maximum junction temperature and 1 W steady-state power dissipation, with pulse power derated linearly above 25°C ambient per Fig.2. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability board-level protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 16 V - Maximum continuous reverse operating voltage before conduction begins; sets minimum system rail margin for reliable standby operation. |
| VBR min/max | 17.8 / 21.8 V @ 1 mA - Confirmed avalanche onset range; defines worst-case clamping threshold under production tolerance. |
| VC @ IPPM | 28.8 V @ 13.9 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability; supports compliance with ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2b (battery disconnect). |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; ensures negligible quiescent current draw in always-on systems. |
| TJ max | 150 °C - Maximum allowable junction temperature; constrains thermal pad area and airflow requirements in sealed enclosures. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with IPC-7351B footprint and 0.060 g mass for pick-and-place accuracy. |
Pinout & Package
DO-214AC (SMA) package: single-axis, two-terminal, unidirectional configuration with molded plastic body, matte tin-plated leads, and visible cathode band indicating terminal polarity. Cathode is marked; anode is unmarked lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point in protected circuit; establishes return path for surge current. |
| Cathode | High-side transient clamp node | Connected to protected line (e.g., +15 V input); conducts avalanche current into ground when Vin exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures consistent VBR distribution across production lots and long-term stability under thermal cycling (−55°C to +150°C). |
| Fast response time <1.0 ps | Enables clamping before transient energy couples into sensitive analog or digital circuitry - critical for CAN/LIN bus interface protection. |
| ISO 7637-2 compliance | Validated for automotive-grade surge immunity including Pulse 1 (load dump simulation), Pulse 2a (switching transient), and Pulse 3b (capacitive coupling). |
| MSL Level 1 rating | Permits unlimited floor life and standard reflow without baking; eliminates moisture-related popcorning risk during assembly. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU; supports environmental compliance for global OEM programs. |
Applications
| Industrial DC/DC Converter Input Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: 15 V input stage of isolated buck converter powering microcontroller and sensor subsystems in factory automation equipment. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between VIN and GND, clamping induced surges from relay switching or motor drive crosstalk. Use Value: Limits transient overvoltage to ≤28.8 V, preventing latch-up or gate oxide damage in upstream PMICs and downstream LDOs. | Use Scenario: 12 V battery-supplied power input to BCM controlling door locks, lighting, and HVAC actuators. IC Role / Device Role / Timing Role: Primary surge suppression element on main power rail, positioned ahead of fuse and input filter capacitor. Use Value: Withstands 400 W pulses per ISO 7637-2 Pulse 1 (load dump), maintaining system uptime during vehicle ignition and alternator regulation events. |
| LED Driver Power Supply Clamp | Industrial Ethernet Switch PoE Port Protection |
Use Scenario: Constant-current LED driver board receiving 24 V DC from centralized supply in commercial lighting fixture. IC Role / Device Role / Timing Role: Standoff-rated TVS on input rail to absorb inductive kickback from nearby solenoid drivers and ESD from service personnel contact. Use Value: 16 V VWM allows full utilization of 24 V rail headroom while clamping transients below 29 V - preserving driver IC reliability without overdesigning input capacitors. | Use Scenario: Data + power port of IEEE 802.3af/at-compliant industrial switch exposed to field wiring surges and lightning-induced coupling. IC Role / Device Role / Timing Role: Secondary-level TVS on DC input side of PoE PD controller, complementing primary front-end protection. Use Value: Low clamping voltage (28.8 V) prevents overvoltage shutdown of PoE interface ICs during combined data-line and power-line surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16A | Narrower VBR range (17.8–19.7 V) and lower VC (26.0 V @ 15.4 A); tighter tolerance improves predictability in precision-clamp designs. | Better suited for low-voltage logic rails where <26 V clamping is mandatory; slightly reduced peak current capacity. | Select SMAJ16A when clamping voltage margin is constrained and tighter VBR distribution is required. |
| SMBJ16 | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; higher thermal mass supports longer pulse durations and improved derating. | Preferred for high-temperature environments (>85°C ambient) or applications requiring >1000 pulses lifetime due to superior heat dissipation. | Choose SMBJ16 when board space permits and thermal robustness outweighs size constraints. |
Compared with SMAJ16A, the SMAJ16 offers broader VBR tolerance and higher peak current handling at the cost of slightly elevated clamping voltage; versus SMBJ16, it trades thermal margin and pulse endurance for compact DO-214AC footprint - making SMAJ16 optimal for space-constrained, cost-sensitive 15 V rail protection where ISO 7637-2 compliance is mandatory.
Availability
SMAJ16 is available at Aetrix Electronics and suitable for industrial DC/DC converters, automotive body control modules, and LED driver power supplies requiring stable component supply, full MSL1 handling, and ISO 7637-2 certified surge immunity.
Supply support for SMAJ16 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMAJ series was developed specifically for high-reliability, surface-mount transient suppression in harsh electromagnetic environments - emphasizing fast response, low leakage, and standardized packaging for automated manufacturing.
FAQ
What is the maximum clamping voltage of the SMAJ16 under standard test conditions?
The SMAJ16 has a maximum clamping voltage (VC) of 28.8 V when subjected to its rated peak pulse current of 13.9 A using the 10/1000 µs waveform. This value is measured at TA = 25°C and represents the upper limit of voltage seen by downstream circuitry during a surge event. The SMAJ16 maintains this clamping performance across its full operational temperature range, with minor derating above 25°C per the manufacturer's pulse derating curve.
Is the SMAJ16 suitable for bidirectional transient protection?
No, the SMAJ16 is a unidirectional TVS diode intended only for DC line protection with defined polarity. Its cathode band must be oriented toward the positive rail, and it does not conduct in forward bias beyond typical diode drop (~3.5 V at 25 A). For bidirectional applications such as AC lines or data bus protection, the SMAJ16CA or SMAJ16A variants - explicitly marked and characterized for symmetrical clamping - must be used instead.
What is the working stand-off voltage (VWM) specification for the SMAJ16?
The SMAJ16 has a working stand-off voltage (VWM) of 16 V, meaning it remains non-conductive up to this reverse voltage under normal operating conditions. This value ensures compatibility with 15 V nominal systems while providing sufficient margin against ripple and tolerance drift. VWM is guaranteed across the full −55°C to +150°C junction temperature range and is validated with IR <1 µA at 16 V.
Does the SMAJ16 meet automotive surge immunity standards?
Yes, the SMAJ16 meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering load dump, supply interruption, and capacitive coupling transients common in 12 V automotive electrical systems. Its 400 W peak pulse power rating, fast <1.0 ps response, and MSL1 qualification make it suitable for under-hood and cabin-mounted ECUs where reliability under repeated surge stress is critical.
What is the package type and lead finish of the SMAJ16?
The SMAJ16 uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads that comply with J-STD-002 solderability requirements. Its dimensions conform to JEDEC standards, and the cathode is marked with a visible band. The device weighs approximately 0.060 g and is rated for moisture sensitivity level (MSL) 1 - permitting indefinite storage and standard reflow without preconditioning.
SMAJ16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 28.8V
- Current - Peak Pulse (10/1000µs):
- 13.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ16 FAQ
1.How can I place an order for SMAJ16 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ16 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMAJ16 reliable?
The price and inventory of SMAJ16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ16 is usually 5 days.
3.What payment methods are accepted for SMAJ16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ16?
SMAJ16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ16 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMAJ16?
For technical support, including SMAJ16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ16 requirements.
6.How does Aetrix verify that SMAJ16 is sourced from the original manufacturer or authorized distributors?
All SMAJ16 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ16 meets industry standards.
7.What is the process for return or replacement of SMAJ16?
All SMAJ16 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ16, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMAJ16 part is unused and in its original packaging.
Return procedure for SMAJ16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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